US8474366B2 - Piston with a skirt having oil flow slots and method of construction thereof - Google Patents

Piston with a skirt having oil flow slots and method of construction thereof Download PDF

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Publication number
US8474366B2
US8474366B2 US12/617,772 US61777209A US8474366B2 US 8474366 B2 US8474366 B2 US 8474366B2 US 61777209 A US61777209 A US 61777209A US 8474366 B2 US8474366 B2 US 8474366B2
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United States
Prior art keywords
piston
convex outer
recessed
pin
extending
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US12/617,772
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English (en)
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US20100050861A1 (en
Inventor
Miguel Azevedo
Andrew Leibold
Airton Martins
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Tenneco Inc
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Federal Mogul LLC
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Priority claimed from US12/190,256 external-priority patent/US8042453B2/en
Assigned to FEDERAL-MOGUL CORPORATION reassignment FEDERAL-MOGUL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AZEVEDO, MIGUEL, LEIBOLD, ANDREW, MARTINS, AIRTON
Priority to US12/617,772 priority Critical patent/US8474366B2/en
Assigned to FEDERAL-MOGUL CORPORATION reassignment FEDERAL-MOGUL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AZEVEDO, MIGUEL, LEIBOLD, ANDREW, MARTINS, AIRTON
Application filed by Federal Mogul LLC filed Critical Federal Mogul LLC
Publication of US20100050861A1 publication Critical patent/US20100050861A1/en
Priority to KR1020127009929A priority patent/KR101839072B1/ko
Priority to EP10779634.4A priority patent/EP2499347B1/en
Priority to BR112012011293A priority patent/BR112012011293A2/pt
Priority to PCT/US2010/056335 priority patent/WO2011060131A1/en
Priority to JP2012538969A priority patent/JP6013914B2/ja
Priority to CN201080051072.9A priority patent/CN102667126B/zh
Publication of US8474366B2 publication Critical patent/US8474366B2/en
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Assigned to FEDERAL-MOGUL LLC, FEDERAL MOGUL POWERTRAIN LLC, FEDERAL-MOGUL CHASSIS LLC, FEDERAL-MOGUL PRODUCTS, INC., FEDERAL-MOGUL IGNITION COMPANY, FEDERAL-MOGUL MOTORPARTS LLC, FEDERAL-MOGUL WORLD WIDE LLC reassignment FEDERAL-MOGUL LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANK OF AMERICA, N.A., AS COLLATERAL TRUSTEE
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Assigned to FEDERAL-MOGUL MOTORPARTS LLC, AS SUCCESSOR TO FEDERAL-MOGUL MOTORPARTS CORPORATION, TENNECO INC., AS SUCCESSOR TO FEDERAL-MOGUL LLC, FEDERAL-MOGUL POWERTRAIN LLC, DRiV Automotive Inc., FEDERAL-MOGUL IGNITION, LLC, AS SUCCESSOR TO FEDERAL-MOGUL IGNITION COMPANY, FEDERAL-MOGUL CHASSIS LLC, FEDERAL-MOGUL WORLD WIDE, INC., AS SUCCESSOR TO FEDERAL-MOGUL WORLD WIDE LLC, FEDERAL-MOGUL PRODUCTS US, LLC, AS SUCCESSOR TO FEDERAL-MOGUL PRODUCTS, INC. reassignment FEDERAL-MOGUL MOTORPARTS LLC, AS SUCCESSOR TO FEDERAL-MOGUL MOTORPARTS CORPORATION RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: WILMINGTON TRUST, NATIONAL ASSOCIATION
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Expired - Fee Related legal-status Critical Current
Adjusted expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/24—Pistons  having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0672—Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/04—Resilient guiding parts, e.g. skirts, particularly for trunk pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/08—Constructional features providing for lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F2200/00—Manufacturing
    • F02F2200/04—Forging of engine parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F2200/00—Manufacturing
    • F02F2200/06—Casting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making

Definitions

  • This invention relates generally to internal combustion engines, and more particularly to pistons for heavy duty diesel engines.
  • an additional known problem can result from a non-uniform, turbulent flow of oil within the cylinder over the path of piston reciprocation.
  • Some of these additional problems include the onset of liner cavitation and increased friction between the piston and the cylinder liner.
  • the liner cavitation is sensitive to the configuration of the piston, particularly where the piston is of a monobloc construction having a fixed skirt formed as one piece with the piston.
  • the increased friction is sensitive to secondary movements of the piston, where, for the lack of guidance, the piston reciprocates cocked within the cylinder liner. Oil control loss can be traced to the high velocity of piston travel, generating a standing wave of oil.
  • oil flooding a phenomenon referred to as “oil flooding”.
  • the majority of the oil is maintained toward the upper crown of the piston, and oil trickles into the ring belt area.
  • the first ring groove floods, whereupon the oil consumption control characteristic is lost.
  • a secondary standing wave of oil forms at the upper edge of the first ring groove. Exposure of this oil to the flame front decomposes and carbonizes the oil in the standing wave, generating soot and formation of carbon deposits.
  • it is desirable to maintain a continual supply of oil in the ring area of a piston too much can be detrimental to the life of the engine and can also reduce the engine performance.
  • a piston manufactured according to the present invention and engine therewith overcomes or greatly minimizes the drawbacks resulting from at least those problems discussed above, thereby allowing diesel engines to operate at an increased performance level, while reducing their fuel consumption, oil consumption and exhaust emissions, besides prolonging their useful life.
  • a piston includes a piston body having an upper crown portion extending along a central axis along which the piston reciprocates and a pair of pin bosses depending from the upper crown.
  • the pin bosses have pin bores aligned with one another along a pin bore axis.
  • the piston further includes a pair of skirt portions arranged on opposite sides of the pin bore axis with each of the skirt portions having a convex outer surface with opposite side edges extending substantially parallel to the central axis to a free end.
  • the skirt portions each have a recessed slot extending radially into the convex outer surface to a recessed surface. The recessed surface extends fully across the convex outer surface to the side edges, thereby separating an upper band section of the convex outer surface from a lower band section of the convex outer surface.
  • a method of constructing a piston includes providing a piston body having an upper crown portion extending along a central axis with a pair of pin bosses depending from the upper crown and having pin bores aligned with one another along a pin bore axis with a pair of skirt portions arranged on opposite sides of the pin bore axis having a convex outer surface. And further, forming a recessed slot extending radially into the convex outer surface.
  • Pistons manufactured in accordance with the present invention improve oil flow over a complete cycle of the piston, reduce dynamic viscous friction over the cycle of the piston, improve the guidance of the piston throughout its complete cycle, reduce cylinder liner cavitation, reduce piston viscous friction loss, reduce carbon build-up in ring grooves of the piston and on piston rings with the grooves, improve the movement of the piston rings, reduce oil consumption and formed carbon adhered to the top land, therefore reducing bore polishing typically caused by carbon build-up, reduce exhaust emissions, and overall improve the running performance and life of the engine.
  • the sum of these beneficial effects reduces engine fuel consumption and promotes more miles-to-gallon.
  • FIG. 1 is a partial perspective view of a piston construction according to a presently preferred embodiment of the invention
  • FIG. 2 is a cross-sectional view taken generally along the line 2 - 2 of FIG. 1 ;
  • FIG. 2A is a quarter cross-sectional view of a piston construction according to another presently preferred embodiment of the invention.
  • FIG. 3 is a schematic fragmentary cross-sectional view taken generally along the line 3 - 3 showing a slot in a skirt of the piston in accordance with one presently preferred embodiment of the invention
  • FIG. 4 is a view similar to FIG. 3 showing a slot in the skirt of the piston in accordance with another presently preferred embodiment of the invention
  • FIG. 5 is a view similar to FIG. 3 showing a slot in the skirt of the piston in accordance with yet another presently preferred embodiment of the invention
  • FIG. 6 is a schematic fragmentary side view of the skirt looking into a slot constructed in accordance with one presently preferred embodiment of the invention.
  • FIG. 7 is a view similar to FIG. 6 showing a slot constructed in accordance with another presently preferred embodiment of the invention.
  • FIG. 8 is a view similar to FIG. 6 showing a slot constructed in accordance with another presently preferred embodiment of the invention.
  • FIG. 9 is a partial cross-sectional view of a piston construction according to another presently preferred embodiment of the invention.
  • FIG. 10 is a view of the piston of FIG. 9 looking generally in the direction of arrow 10 ;
  • FIG. 11 is a partial cross-sectional view of a piston construction according to another presently preferred embodiment of the invention.
  • FIG. 12 is a view of the piston of FIG. 11 looking generally in the direction of arrow 12 .
  • FIGS. 1 and 2 illustrate a piston 10 constructed according to one presently preferred embodiment of the invention for reciprocating movement in a cylinder bore (not shown) of an internal combustion engine, such as a diesel engine.
  • the piston 10 has a body 12 , either cast or forged, or by any other process of manufacture, extending along a central axis 14 along which the piston 10 reciprocates in the cylinder bore.
  • the body 12 is represented, by way of example and without limitation, as having an upper crown 16 joined to a lower crown 18 having a pair of pin bosses 20 depending from the upper crown to provide laterally spaced pin bores 22 aligned along a pin bore axis 24 that extends generally transverse to the central axis 14 .
  • the pin bosses 20 are joined to laterally spaced skirt portions 26 via strut portions 28 , thereby forming a so called “monobloc” piston wherein the skirt portions 26 are formed as one piece of material with the pin bosses 20 .
  • the skirt portions 26 are diametrically spaced from one another across the pin bore axis 24 and have convex outer surfaces 30 contoured for cooperation with the cylinder bore to maintain the piston 10 in a desired orientation as it reciprocates through the cylinder bore.
  • a hydrodynamic oil film is developed and maintained between the outer surfaces 30 of the skirt portions 26 and the wall of the cylinder bore to minimize dynamic friction therebetween.
  • through slots referred to hereafter as openings 32 unless otherwise stated, are formed in the skirt portions 26 .
  • the upper crown 16 of the piston 10 is represented here as having an upper surface 36 with a combustion bowl 38 recessed therein to provide a desired gas flow with the cylinder bore.
  • An outer wall or ring belt 40 extends downwardly from the upper surface 36 , with at least one annular ring groove 42 being formed in the ring belt 40 for floating receipt of a piston ring 44 .
  • the piston ring 44 when properly functioning in its free floating state, facilitates guiding the piston 10 during reciprocation within the cylinder bore, while also sealing combustion gases and inhibiting the passage of oil upwardly thereby from below the piston body 12 .
  • the lower crown 18 is represented here as being formed separately from the upper crown 16 , such as in a forging process, and then joined thereto, wherein the upper and lower crowns 16 , 18 can be joined together by a weld joint 46 , for example.
  • a piston 10 constructed in accordance with the invention could have an upper and lower crown portions formed otherwise, such as in a casting process, for example, and that they could be joined using mechanisms other than a weld joint.
  • FIG. 2A A piston construction in accordance with another presently preferred embodiment is shown in FIG. 2A generally at 10 ′.
  • the same reference numerals discussed above and below have been applied to designate like features, wherein the reference numerals are primed.
  • the openings 32 in the skirt portions 26 have upper and lower edges 48 , 50 , respectively, extending generally parallel to a horizontal plane extending through the pin bore axis 24 and generally transverse to the central axis 14 and sides 52 , 54 extending generally transverse to the horizontal plane between the upper and lower edges 48 , 50 .
  • the upper and lower edges 48 , 50 correspond generally to a length of the opening 32
  • the sides 52 , 54 correspond generally to a width of the opening 32 , although the maximum widths can extend or bow outwardly from the sides 52 , 54 .
  • the relation of the length to the width of the opening 32 is such that the length is greater than the width, however, the aspect ratio of length-to-width is relatively low.
  • the openings 32 are generally wide. Each of the openings 32 provides an open space 56 occupying between about 20-80 percent of the respective total area of the respective skirt portion 26 , wherein the individual skirt portion total area is bordered generally by an outer perimeter 58 ( FIG. 1 ) of the skirt outer surface 30 . Accordingly, the area of the skirt outer surface 30 capable of being moved into frictional engagement with the cylinder bore is reduced to between about 20-80 percent of the total area of the skirt portion 26 , depending on the relative size of the opening 32 to the total area of the skirt portion 26 . As such, the potential dynamic frictional losses resulting between the skirt portions 26 and the cylinder wall is reduced, in addition to significantly reducing the weight of the piston. It has been discovered that an opening forming about a 40 percent reduction in the skirt outer surface area results in about an 80 percent reduction in friction from the maximum practically achievable.
  • the openings 32 extend sufficiently across the skirt portions 26 to form upper and lower band sections 60 , 62 .
  • the upper and lower band sections 60 , 62 can be provided having a generally symmetrical shape, but non-symmetrical shapes are also contemplated, depending on the intended application. Included herein is the aspect that openings 32 can be configured in such a way as to provide discrete bearing “pads”, i.e., distinct individually isolated load bearing areas. Much of the present discussion about approach and trailing angles to the skirt band sections also apply rigorously, possibly more so, to these discrete pads. This latter configuration is not depicted by drawings, but is an aspect considered to within the scope of this invention.
  • the upper and lower edges 48 , 50 have respective smooth rounded, and referred to hereafter as chamfered surfaces 64 , 66 , extending from the outer surface 30 of the skirt portion 26 to an inner surface 68 of the opening 32 .
  • the smooth chamfered surfaces 64 , 66 direct oil both radially inwardly into the openings 32 and into the cavity 34 , while also maintaining a sufficient amount of oil between the outer surfaces 30 of the upper and lower band sections 60 , 62 and the cylinder bore.
  • the upper chamfered surface 64 promotes the ingress of oil through the openings 32 and into the cavity 34
  • the lower chamfered surface 66 promotes the ingress of oil though the openings 32 and into the cavity 34 . Accordingly, by directing oil inwardly into the openings 32 , the hydraulic pressure gradient is perfectly determined over both bands 60 , 62 .
  • the phenomenon of forming a standing wave of oil adjacent the ring belt 40 between the down stoke and upstroke is prevented, thereby eliminating the oil flooding phenomenon in the region of the ring belt 40 .
  • carbon deposits in the area of the ring belt 40 , and particularly on the piston ring 44 and in the piston ring groove 42 is avoided.
  • the piston ring 44 is able to maintain a free floating motion within the ring groove 42 to facilitate its sealing function within the cylinder bore, while also preventing an oil migration condition to the top land.
  • the present skirt design can be shaped to effectively present two, three or more focal bearing locations to the parent liner in contact. Limiting to two or three focal points, for discussion purposes only and without limitation, it can be visualized that a line or triangular support is thus provided. The outcome is that the piston is better guided within the confines of the cylinder bore, reciprocating in a concentric fashion. This configuration is conducive to less Coulomb friction and more of a fully hydrodynamic lubrication and a stable reciprocating regime. A corollary to the exposed is that impacts are thus avoided and mechanical excitation of the liner minimized. Cavitation on the coolant side of the liner is thus prevented to a large extent.
  • the openings 32 can be formed having smooth chamfered surfaces that are non-symmetrical to one another.
  • the upper chamfered surface 64 has a greater radius of curvature (R), or more gradual polynomial curve in relation to the radius of curvature (r) of the lower chamfered surface 66 .
  • the upper chamfered surface 64 has a reduced radius of curvature (r), or less gradual polynomial curve in relation to the radius of curvature (R) of the lower chamfered surface 66 .
  • the openings 32 can be constructed having different configurations, as best suited for the piston application.
  • the openings 32 can be constructed having a generally symmetrical shape along the lengths of the upper and lower edges 48 , 50 .
  • the upper and lower edges 48 , 50 can be constructed having differing, non-symmetrical shapes.
  • FIG. 7 shows an embodiment of an opening 32 having an upper edge 48 with an increased radius of curvature (R) along its length in relation to the radius of curvature (r) of the lower edge 50 .
  • FIG. 8 shows an embodiment of an opening 32 having an upper edge 48 with a reduced radius of curvature (r) along its length in relation to the radius of curvature (R) of the lower edge 50 .
  • the openings 32 can be constructed having a multitude of configurations to attain the desired radially inwardly flow of oil through the slots 32 and into the cavity 34 , while also maintaining the desired thickness of the hydrodynamic oil layer between the upper and lower band sections 60 , 62 and the cylinder bore wall.
  • the same considerations apply if discreet bearing pads are used in lieu of bands.
  • various permutations of the discussed embodiments may be configured, such that the radius of chamfered surfaces 64 , 66 of the upper and lower edges 48 , 50 and the radius of curvature (r,R) of the upper and lower edges 48 , 50 along their lengths can be adjusted and combined, as necessary.
  • a piston 110 constructed according to another presently preferred embodiment of the invention is shown, wherein the same reference numerals as used above, offset by a factor of 100, are used to identify like features.
  • the piston 110 has a body 112 extending along a central axis 114 , as described above, having an upper crown 116 joined to a lower crown 118 with a pair of pin bosses 120 depending from the upper crown to provide laterally spaced pin bores 122 aligned along a pin bore axis 124 that extends generally transverse to the central axis 114 .
  • a pair of skirt portions 126 are spaced diametrically from one another across the pin bore axis 124 and have convex outer surfaces 130 contoured for cooperation with the cylinder bore to maintain the piston 110 in a desired orientation as it reciprocates through the cylinder bore.
  • a hydrodynamic oil film is developed and maintained between the outer surfaces 130 of the skirt portions 126 and the wall of the cylinder bore to minimize dynamic friction therebetween.
  • recessed “blind slots”, referred to hereafter as recessed slots or slots 132 are formed in the skirt portions 126 .
  • the upper crown 116 of the piston 110 is represented here as having an upper surface 136 with a combustion bowl 138 recessed therein to provide a desired gas flow with the cylinder bore.
  • An outer wall or ring belt 140 extends downwardly from the upper surface 136 , with at least one annular ring groove 142 being formed in the ring belt 140 for floating receipt of a piston ring (not shown).
  • the lower crown 118 is represented here as being formed separately from the upper crown 116 and can be joined to the upper crown 116 by a friction weld joint 146 or otherwise, as discussed above.
  • the slots 132 in the skirt portions 126 extend across the full width of the skirt portions 126 .
  • the slots 132 have respective upper and lower edges 148 , 150 extending parallel or substantially parallel to a horizontal plane extending through the pin bore axis 124 and recessed side edges 152 , 154 extending parallel or substantially parallel to the central axis 114 .
  • the upper and lower edges 148 , 150 correspond generally to a full length of the slot 132
  • the side edges 152 , 154 correspond generally to a width of the slot 132 .
  • the relation of the length to the width of the slot 132 is such that the length is greater than the width.
  • Each of the slots 132 provides a recessed or “blind” pocket, referred to hereafter as space 156 , occupying between about 20-80 percent of the respective total surface area of the respective skirt portion 126 . Accordingly, the area of the skirt outer surface 130 capable of being moved into frictional engagement with the cylinder bore is reduced to between about 20-80 percent of the total area of the skirt portion 126 , depending on the relative size of the slot 132 to the total area of the skirt portion 126 . As such, as mentioned above with regard to the piston 10 , the potential dynamic frictional losses resulting between the skirt portions 126 and the cylinder wall is reduced, in addition to significantly reducing the weight of the piston.
  • the slots 132 extend completely across the skirt portions 126 , and thus, form upper and lower band sections 160 , 162 .
  • the upper and lower band sections 160 , 162 can be provided having a generally symmetrical shape, but non-symmetrical shapes are also contemplated, depending on the intended application. Accordingly, it is to be understood that the upper and lower edges 148 , 150 can be provided having non-linear configurations, as shown in FIGS. 5-8 , for example, and further, it is to be understood that the upper and lower edges 148 , 150 can be provided having the same radius of curvature, or different radius of curvature, as shown in FIGS. 3-5 .
  • each recessed surface 70 provides a solid, continuous surface across the entirety of each slot 132 .
  • the depth of the slots 132 extends between about 25-75 percent of the total thickness of the skirt portions 126 , wherein the percent can vary over the length of the slots 132 , as desired. As such, the recessed surface of the slots 132 is assured of maintaining clearance with the wall of the cylinder bore.
  • a piston 210 constructed according to another presently preferred embodiment of the invention is shown, wherein the same reference numerals as used above, offset by a factor of 200 , are used to identify like features.
  • the piston 210 has a body 212 extending along a central axis 214 , as described above, having an upper crown 216 joined to a lower crown 218 with a pair of pin bosses 220 depending from the upper crown to provide laterally spaced pin bores 222 aligned along a pin bore axis 224 that extends generally transverse to the central axis 214 .
  • a pair of skirt portions 226 are spaced diametrically from one another across the pin bore axis 224 and have convex outer surfaces 230 contoured for cooperation with the cylinder bore to maintain the piston 210 in a desired orientation as it reciprocates through the cylinder bore.
  • recessed slots 232 are formed in the skirt portions 126 .
  • a plurality of holes or through openings 72 extend through the recessed wall into a cavity 234 formed between the skirt portions 226 .
  • the upper crown 216 and lower crown 218 are represented as being formed separately from one another and then joined by a friction weld joint 246 or otherwise, as discussed above.
  • the slots 232 in the skirt portions 226 extend across the full width of the skirt portions 226 .
  • the slots 232 have respective upper and lower edges 248 , 250 extending parallel or substantially parallel to a horizontal plane extending through the pin bore axis 224 and recessed side edges 252 , 254 extending parallel or substantially parallel to the central axis 214 .
  • Each of the slots 232 provides a recessed pocket 256 occupying between about 20-80 percent of the respective total surface area of the respective skirt portion 226 .
  • the slots 232 form upper and lower band sections 260 , 262 having a generally symmetrical shape to form discrete bearing “pads”, as discussed above, but non-symmetrical shapes are also contemplated, depending on the intended application. Accordingly, it is to be understood that the upper and lower edges 248 , 250 can be provided having non-linear configurations, as shown in FIGS. 5-8 , for example, and further, it is to be understood that the upper and lower edges 248 , 250 can be provided having the same radius of curvature, or different radius of curvature, as shown in FIGS. 3-5 .
  • the slots 232 extend into the outer surfaces 230 of the skirt portions 226 a predetermined depth to a recessed surface 270 , but not through the full thickness of the skirt portions 226 .
  • the depth of the slots 232 extends between about 25-75 percent of the total thickness (t) of the skirt portions 226 , wherein the percent can vary over the length of the slots 232 , as desired. Accordingly, the wall thickness of the recessed slots 232 can vary continuously over the length of the slots 232 .
  • the through openings 72 extending completely through the recessed wall portion, meaning the through openings extend through the recessed surface 270 and open into the cavity 234 .
  • the through openings 72 are shown as being cylindrical and having a circular diameter that is less than the width of the slots 232 immediately axially above and below the through openings 72 , wherein the width extends between the upper and lower edges 248 , 250 . Further, the through openings 72 are shown being centered or substantially centered between the upper and lower edges 248 , 250 . Accordingly, the recess surface 270 extends above and below the through openings 72 , such that the through openings 72 are bounded circumferentially by the recessed surface 270 .
  • each skirt portion 226 extend along parallel or substantially parallel axes to one another.
  • each of the through openings 72 in one skirt portion 226 are formed diametrically opposite and extend coaxially with one of the through openings 72 in the opposite skirt portion 226 .
  • the diametrically opposite through openings 72 that extend coaxially to one another can be formed in a single cutting operation from one side of the piston 210 , such as with a cutting tool of sufficient length to extend through both skirt portions 226 from one side of the piston 210 .
  • each skirt portion 226 has three through openings 72 , with one through opening 72 being centered between the opposite side edges 252 , 254 and the other through openings 72 being located on opposite sides of the centered hole 72 and spaced equidistantly from the centered through opening 72 .
  • through openings 72 can be used than as shown, whether being even or odd in number.
  • a method of forming the openings and/or slots 32 , 32 ′, 132 , 232 discussed above and shown in the Figures is provided.
  • the openings and/or slots 32 , 32 ′, 132 , 232 can be formed having a variety of shapes and sizes as shown and discussed, such as in machining processes including, milling, broaching, laser, drilling, or by forging or casting processes, for example. Further, the openings can be further processed to deburr edges, such as in milling, shot blasting or turning processes, for example. It should be recognized that a combination of the aforementioned manufacturing processes can be used in the construction of the pistons 10 , 10 ′, 110 , 210 .
  • the piston body 12 , 12 ′, 112 , 212 could first be cast or forged, and then milled, broached, laser formed, or drilled and/or shot blast or turned.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US12/617,772 2007-08-13 2009-11-13 Piston with a skirt having oil flow slots and method of construction thereof Expired - Fee Related US8474366B2 (en)

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Application Number Priority Date Filing Date Title
US12/617,772 US8474366B2 (en) 2007-08-13 2009-11-13 Piston with a skirt having oil flow slots and method of construction thereof
CN201080051072.9A CN102667126B (zh) 2009-11-13 2010-11-11 裙部具有油流槽的活塞及其构造方法
KR1020127009929A KR101839072B1 (ko) 2009-11-13 2010-11-11 오일 유동 슬롯을 가지고 있는 스커트를 가진 피스톤 및 이 피스톤의 제작 방법
JP2012538969A JP6013914B2 (ja) 2009-11-13 2010-11-11 スカートがオイルフロースロットを有するピストン、およびその構築方法
PCT/US2010/056335 WO2011060131A1 (en) 2009-11-13 2010-11-11 Piston with a skirt having oil flow slots and method of construction thereof
EP10779634.4A EP2499347B1 (en) 2009-11-13 2010-11-11 Piston with a skirt having oil flow slots and method of construction thereof
BR112012011293A BR112012011293A2 (pt) 2009-11-13 2010-11-11 pistão, e método para construir um pistão

Applications Claiming Priority (3)

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US95542307P 2007-08-13 2007-08-13
US12/190,256 US8042453B2 (en) 2007-08-13 2008-08-12 Piston with a skirt having oil flow slots
US12/617,772 US8474366B2 (en) 2007-08-13 2009-11-13 Piston with a skirt having oil flow slots and method of construction thereof

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US8474366B2 true US8474366B2 (en) 2013-07-02

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JP (1) JP6013914B2 (ja)
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DE102011113800A1 (de) * 2011-09-20 2013-03-21 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
JP6170509B2 (ja) * 2012-02-20 2017-07-26 フェデラル−モーグル・リミテッド・ライアビリティ・カンパニーＦｅｄｅｒａｌ−Ｍｏｇｕｌ Ｌｌｃ 内燃エンジン用のピストン組立体
US9611806B2 (en) 2014-11-18 2017-04-04 Caterpillar Inc. Engine piston
US9759156B2 (en) * 2015-03-04 2017-09-12 Mahle International Gmbh Asymmetric piston
EP3284939B1 (de) * 2016-08-19 2020-07-15 Andreas Stihl AG & Co. KG Kolben für einen mit spülvorlage arbeitenden zweitaktmotor und zweitaktmotor
FR3061756B1 (fr) * 2017-01-11 2019-05-10 H.E.F. Piston pour machine thermique, machine thermique comprenant un tel piston, et procedes
KR20180128533A (ko) * 2017-05-23 2018-12-04 현대자동차주식회사 엔진의 피스톤
CN107103821B (zh) * 2017-07-05 2023-07-21 石河子大学 一种流体一维雷诺方程实验装置及其实验方法
JP2021088931A (ja) * 2018-03-20 2021-06-10 日立Astemo株式会社 内燃機関のピストン
US20190331222A1 (en) * 2018-04-26 2019-10-31 Federal-Mogul Llc Piston with optimized oil ring negation
DE102019216252A1 (de) 2019-10-22 2021-04-22 Mahle International Gmbh Kolben für eine Brennkraftmaschine

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CN102667126B (zh) 2015-04-15
JP2013510991A (ja) 2013-03-28
CN102667126A (zh) 2012-09-12
BR112012011293A2 (pt) 2017-10-10
US20100050861A1 (en) 2010-03-04
KR101839072B1 (ko) 2018-03-16
JP6013914B2 (ja) 2016-10-25
WO2011060131A1 (en) 2011-05-19
EP2499347A1 (en) 2012-09-19
EP2499347B1 (en) 2019-05-15
KR20120106722A (ko) 2012-09-26

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